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The HM408 Commercial Battery Box is a battery storage solution for sizes group 4D batteries including Marine RV and Commercial equipment. It features a four corner fastening system and captive lid for easy installations large cable entry holes for heavy gauge wires full flow ventilation for releasing battery gasses and a large battery acid reservoir. Its rugged rotationally molded design provides ultimate protection in low-temperature environments and protects against UV oil gas and other contaminants. Perfect installation in a boat camper motorhome trailer or caravan as well as commercial and generator equipment. Designed for a group 4D batteries. A four-corner fastening system for easy installation. Large cable entry holes for heavy gauge wires up to 4/0 AWG. Large internal reservoir to collect battery acid. Rugged rotationally molded design for extreme conditions. Meets Coast Guard USCG Code of Federal Regulations 183.420. Meets American Boat and Yacht Council ABYC E-10.7.